Don't tell your friends about your indigestion. "How are you" is a greeting, not a question.
I have never developed indigestion from eating my words.
More organizations die of indigestion than starvation
Sometimes it's hard to tell what's love and what's only indigestion
Please tell me the cave just had a little indigestion. (Kat)
What seems to be love beyond any question is usually a simple case of indigestion.
He who sows hurry reaps indigestion.